https://github.com/mrgravity817/seq-genserver

Basic Elixir OTP server using GenServer as a sub-behaviour
https://github.com/mrgravity817/seq-genserver

elixir erlang erlang-otp genserver

Last synced: 6 days ago
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Basic Elixir OTP server using GenServer as a sub-behaviour

• Host: GitHub
• URL: https://github.com/mrgravity817/seq-genserver
• Owner: MRGRAVITY817
• Created: 2022-06-27T12:22:57.000Z (over 2 years ago)
• Default Branch: main
• Last Pushed: 2022-06-29T15:02:56.000Z (over 2 years ago)
• Last Synced: 2023-03-05T02:53:37.550Z (over 1 year ago)
• Topics: elixir, erlang, erlang-otp, genserver
• Language: Elixir
• Homepage:
• Size: 5.86 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Sequence

A simple elixir server that increments the integer every time when client calls the server. Education-purpose project from the book _Programming Elixir_ by Dave Thomas.

## Installation

If [available in Hex](https://hex.pm/docs/publish), the package can be installed

by adding `sequence` to your list of dependencies in `mix.exs`:

```elixir

def deps do

  [

    {:sequence, "~> 0.1.0"}

  ]

end

```

## Usage

```bash

$ iex -S mix

# Start link with server

iex(1)> Sequence.Server.start_link 100

{:ok, #PID<0.151.0>}

# increment number from 100 -> 101

iex(2)> Sequence.Server.next_number   

100

# increment number from 101 -> 102

iex(3)> Sequence.Server.next_number

101

# add number 50

iex(4)> Sequence.Server.increment_number 50

:ok

iex(5)> Sequence.Server.next_number        

152

iex(6)> Sequence.Server.next_number

153

```

## Debugging options

With `:trace` option,

```bash

iex(2)> GenServer.start_link(Sequence.Server, 100, [debug: [:trace]])

{:ok, #PID<0.186.0>}

iex(3)> GenServer.call(pid, :next_number)

*DBG* <0.186.0> got call next_number from <0.183.0>

*DBG* <0.186.0> sent 100 to <0.183.0>, new state 101

100     

```

With `:statistics` option

```elixir

iex(5)> {:ok, pid} = GenServer.start_link(Sequence.Server, 100, [debug: [:statistics]])

{:ok, #PID<0.190.0>}

iex(6)> GenServer.call(pid, :next_number)                                              

100     

iex(7)> GenServer.call(pid, :next_number)                                              

101     

iex(8)> :sys.statistics pid, :get

{:ok,   

 [

   start_time: {{2022, 6, 28}, {9, 40, 38}},

   current_time: {{2022, 6, 28}, {9, 41, 2}},

   reductions: 99,

   messages_in: 2,

   messages_out: 2

 ]}

```